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River Valley
An area with a river and good land for farming.

Slash and Burn Farming
Cutting plants and burning them to make fertilizer for soil.

Irrigation
Creating canals to bring water to farms and houses.

Surplus
Having more than what is needed or used.

Silt
Mud and clay that is pushed onto the shore by rivers and helps make soil fertile.

Cultural Diffusion
The spread of goods and ideas from one culture to another.

Ziggurats
A pyramid-shaped religious temple in Mesopotamia.

Pictograms
Pictures that represent words and ideas.

Cuneiform
The first written language, invented in Sumer.

City-States
A city and its surrounding farm lands and villages.

Trade
Buying, selling, and/or exchanging goods.
Merchants
A person who buys, sells, and/or exchanges goods.
Social Classes
Groups of people with different rights, responsibilities, and respect.